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The problem comes into play when you try to select the actual LOB locator remotely, however straight INSERTs aren't a problem.
Code:
SQL> desc test_clob1
Name Null? Type
----------------------------------------- -------- -----------------------
A1 NUMBER
A2 CLOB
SQL> desc test_clob2@remotedb
Name Null? Type
----------------------------------------- -------- -----------------------
A1 NUMBER
A2 CLOB
SQL> declare
2 big_text varchar2(32767) := rpad('#',32767,'#');
3 begin
4 insert into test_clob1 values (1, big_text );
5 end;
6 /
PL/SQL procedure successfully completed.
SQL> select a1, dbms_lob.getlength(a2) from test_clob1;
A1 DBMS_LOB.GETLENGTH(A2)
---------- ----------------------
1 32767
SQL> select count(*) from test_clob2@remotedb;
COUNT(*)
----------
0
SQL> insert into test_clob2@remotedb
2 select * from test_clob1;
1 row created.
SQL> select a1, dbms_lob.getlength(a2) from test_clob2@remotedb;
select a1, dbms_lob.getlength(a2) from test_clob2@remotedb
*
ERROR at line 1:
ORA-22992: cannot use LOB locators selected from remote tables
SQL> commit;
Commit complete.
However, if I do a COMMIT and then go to the remote database and do the same query, I get the following:
Code:
SQL> select a1, dbms_lob.getlength(a2) from test_clob2;
A1 DBMS_LOB.GETLENGTH(A2)
---------- ----------------------
1 32767
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Originally Posted by tvrdileep
Hai Basan.
I only see Transparent Gateways for DB2, MS-SQL Server etc.
Please let me know more about this.
You are right.
Originally Posted by tvrdileep
Also, How to check whether my database is using Generic Connectivity or not?
You can see HS folder under Oracle_home and in tnsnames file service name for tg4msql (for ms sqlserver) listed with HS = ok.
Originally Posted by tvrdileep
Also, you said that you are able to access LOBS using PL/SQL, TRIGGERS etc using DBLinks. Are you able to use direct SQL also to SELECT data from remote Database using DBLink?
No, only through procedures and triggers.
"What is past is PROLOGUE"
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Hai Everybody.
I came to know from above discussions that we can only INSERT into LOB Column of remote database table using DBLink. SELECT is not possible using DBLink.
I would like to what is the workaround for this? I want to do both SELECT and INSERT into remote database using DBLink. I mean if its possible by using JAVA/PL SQL, can anyone tell me what is the procedure?
regards,
Dileep Tallam.
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Code:
import java.sql.*;
import java.io.*;
import oracle.sql.*;
public class ....
{
public static Blob getBlob
{
Blob srcbloc;
DriverManager.......;
Connection conn_src = ...........
Statement stmt = ...
ResultSet rs_src = stmt.executeQuery("
Select pic from tab_pics where id = 1");
srcblob = ((OracleResultSet)rs_src).getBLOB(1);
return srcBlob;
}
public static void loadBlob throws exception
{
DriverManager.......;
Connection conn_dest = ...........;
OraclePreparedStatement stmt = (OraclePreparedStatement) conn.prepareStatement("insert into tab_pic values(1, ?)");
stmt.setBlob(1, getBlob);
ops.execute();
conn_dest.commit();
}
}
You can access this two procedures even from PL/SQL by publishing it
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Hai Tabreaz.
Thanks for your info. One of our development guy said that he could neither SELECT/INSERT data from/into LOB column of a remote database table using DBLink. Could you tell me if its possible by using DBLink?
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Try it out using PL/SQL or Java Stored procedure, no resources for testing such.
If you face any problem, then someone for sure help you in specific area.
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Hai.
I have read that if one uses JDBC OCI Drivers then we can use java.sql and java streams for SELECT/INSERT of LOB data and if one uses JDBC Thin Drivers then we have to use PL/SQL and DBMS_LOB Package. I would like to if I'm correct?
regards,
Dileep Tallam.
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Dont know what you waiting for, just test it once. All the alternatives.
All the best
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